Heated forming tool



0d. 24, 1950 E, MARIK 2,526,888

HEATED FORMING TOOL Fiil ed May 6, 1949 INVENTOR f. EMA/Pm A 770/?NE) Patented Oct. 24, 1950 1 UNITED STATES PATENT OFFICE HEATED FORMING TOOL vEdward.nMarik. Bellwood, 111., assignor to Western Electric Company, Incorporated, New York,

N y a. weerefiqn of New York Application-May 6; 1949, Serial No. 91,729 [6 Claims. (01. 219-19) This invention relates-toheated: forming. tools and more particularly to an-electrically heated tool for sealing'the ends-of fusible. interleaving material surrounding a central aperture of. an electrical coil and simultaneously flaring an end of such aperture.- 4

The primary object of this invention is to providea simple and efficient-tool for efiecting the. simultaneous sealing and flaring of -theendportion and central aperture, respectively, of an electrical coil.

In accordance with the provided an apparatus designed. for sealing the protruding ends of heat-fusible interleaving sheets wound between layers'of windings of an electrical coil which hasbeenwoundon amendrel to have a central aperture and simultaneously flaring the wall of such aperture at one end thereof for facilitatingthe latter insertion of the coil core. in the apparatus, there. is provided an annular heated plate which is fixed'to and coaxial with one end of a perforated tube having a flaring tool support fixed to its opposite end and extending through the entiretube and heated plate to carry a flaring tool in position to project beyond the annular heating plate but out'of contact therewith; Thus theheatedplate may be heated to a relatively hightemperature and the heatfrom the plate will be conducted through the tube to the tool support and finally. back at a lower-temperature to the tip of. the flaring tool due tothe dissipation of heat at the tube and tool support. By simply pressing one end of a coil againstthe exposed-annular surface of the heated plate,theflaring-tool will enter the central aperture of the coil, the interleaving heat-fusible'sheets will be fused to each other and simultaneously a flared entrance to the central core aperture of the coil will be formed to insure a free entrance of the core. Acomplete understanding of the invention will be had by reference tothe following detailed description taken in conjunction. with the accompanying drawing, in which Fig. l is a central, longitudinal section, partly in elevation, of an electrically heated tool em. bodying the features of the invention. and showing a coil, in partial longitudinal section, about to be, associated withthe tool for treatment thereby;

Fig. 2 isfian end :view of. the left end of the tool shown in Fig. l; and- Fig. 3 is a view. of the coil similar to, that shown in Fig.1, on anenlarged scale, butv after.

treatment bythefitoOL, '1.

above object, there is disk 2 Referring now to the drawing in detail an particularly to Fig. 1, an electrical heating mem ber is indicated in general at Ill, which comprises an annular encased pressed or molded ll of suitable heat-conducting material having embedded therein a resistance element [2, the heating member l0 supporting terminals [3 connected to opposite ends of the resistance element for supplying current from a suitable source of current to heat the element. The heating member I0 is formed with a central aperture l4, which is of enlarged diameter, indicated at M5, for the greater portion of its length extending inwardly from the right face of the disk. Secured by a heat-resistant cement or otherwise against the left face (Fig. 1) of the member Is to absorb heat therefrom is a metal lic annular heating: plate l! having a reduced central portion- It, the diameter of which closely fits the smaller diameter of the aperture 25in the. heating member Ill. Extending freely into the enlarged diameter it of the aperture iiin the heating member IE1, at its right side, is a horizontally extending tube i9, provided with a slightly enlarged inner diameter at its left end, which. is closely fitted in attached relation to the outer diameter of the reduced portion i8 of the plate [1. It will be observed that the en larged diameter I6 of the central aperture M in the heating member It] serves to space the-pe ity of perforations 2B in order to ventilate its interior.

At its right end, the tube is is also provided with a slightly enlarged inner diameter, in which is closely fitted, in attached relation, a c0llar2l of thermal insulating material, in the aperture of which is closely fitted the right end of a shouldered flaring tool shank portion 22, which extends toward the left and through a central aperture 23 of the annular heating plate l1, but without contacting the heating plate. As indicated at 24, the aperture 2301 the heatingplate H is tapered inwardly toward the outer face of the heating plate so that it will closely surround the flaring tool shank portion 22 in this area. This arrangement insures that the entire annular endwface of a coil will be subjected to the fusing heat from the heating plate and. thus prevent unfused areas of. the coil end face. Attachedto or formed on the assessed 3 outer or left end of the flaring tool shank portion 22 is a flaring tip Surrounding the flaring tool shank portion 22, adjacent its inner or right end, is a collar 2'? of thermal insulating material, which is engaged at three equally spaced points about its periphery by adjustable screws 28, which are threaded through the wall of the tube i9. By manipulating the screws 28, the flaring tip 25 may be maintained concentric with but spaced from the central aperture 23 of the heating plate E2 to minimize the transfer of heat from the plate to the flaring tip. 'The flaring tip 26 is arranged for entrance into'a central core-receiving aperture 29 of a coil 36 (Figsf J. and 3) simultaneously with the operation of posite end of said hollow member and extending at its outer end through the aperture of said heating member and out of contact therewith arranged for entrance into the central aperture of pressing the coil end face against the outer face of the heating plate ll, during which extending ends of interleaving sheets 3i of heat-fusible material are fused and sealed. The supporting and spacing of the flaring tool shank portion 22 by means of the insulating collars 2| and'Z? and screws 28, together with the ventilation of the tube 33 by means of its perforations and the spacing of the tube from the heating member IE] adjacent its attachment to the heating plate I! serves to effectively dissipate a great amount of heat from being conducted to the flaring tip 255 from the heating member If! so that, while the heating plate I? will be heated to a relatively high temperature, the flaring tip will be heated to a desired but much lower temperature. The tube l9 intermediate its length, and from which is supported the heating member Hi, heating plate H and flaring tool shank portion 22, is fixed to a forked bracket 32, shown fragmentarily, which may be mounted on a work bench or other support.

In using the sealing and flaring tool and assuming that the plate I! has been heated to a desired temperature, a coil 30, with the fusible interleaving sheets 3| extending from an end face, is simply moved toward the flaring tip 26 with the central core-receiving aperture 29 of the coil aligned with the tip and pressed into engagement with the outer exposed surface of the heating plate, thus simultaneously fusing or sealing the ends of the interleaving sheets 3| to each other and providing a suitable flare to the end of the aperture of the coil for receiving the coil core.

It is to be understood that the above-described arrangements are merely illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

l. A tool for fusing the ends of heat-fusible material wound between layers of windings in an electrical coil and simultaneously therewith flaring an end of the central core-receiving aperture of the coil comprising an annular heating element, a perforated tube fixed to said element along its central opening and coaxial therewith, a flaring tool support mounted within said tube and supported at the end thereof removed from the annular element by a surrounding collar of thermal insulating material fitted within the base of said tube, said support, at its outer end. being spaced from said heating element, and a flaring tool on the outer end of said support spaced from and extending through the opening of the heating element for engagement with the central aperture of a coil, the interleaving material of which is to be fused.

the coil to flare the coil aperture simultaneously with the fusing of the interleaving material of the coil by contact with the heating member.

3. A tool for fusing the ends of heat-fusible material wound between layers of windings in an electrical coil and simultaneously therewith flaring an end of the central core-receiving aperture of the coil comprising an electrical heating element encased in an annular member, terminals mounted on said member for supplying current to said heating element, an annular heating plate contacting one side face of said member to be heated thereby, a perforated tube attached at one end to said plate and coaxial with the aperture thereof, and a flaring tool concentrically arranged within and supported at its inner end by a collar of thermal insulating material to the opposite end of said tube and extending at its outer end through the aperture of said plate and out of contact therewith arranged for entrance into the central aperture of the coil to flare the coil aperture simultaneously with the fusing of the interleaving material of the coil by contact with the heating plate.

4. A tool for fusing the ends of heat-fusible material wound between layers of windings in an electrical coil and simultaneously therewith flaring an end of the central core-receiving aperture of the coil comprising an annular member enclosing an electrical resistance heating element, terminals mounted on said member for supplying current to said heating element, an annular heating plate in heat-conducting contact at one side face with an opposed face of said member for heating thereby, a tube perforated to ventilate the interior thereof attached at one end to said plate and coaxial with the aperture thereof, a heat-dissipating member concentrically arranged within and attached at its inner end by a collar of thermal insulating material to the opposite end of said tube and at its outer end within the aperture of said plate and out of contact therewith, and a flaring tool on the outer end of said heat-dissipating member arranged for entrance into the central aperture of the coil to flare the coil aperture simultaneously with the fusing of the interleaving material of the coil by contact with the heating plate.

5. A tool for fusing the ends of heat-fusible material wound between layers of windings in an electrical coil and simultaneously therewith flaring an end of the central core-receiving aperture of the coil comprising an annular heating member, a tube perforated to ventilate the interior thereof attached at one end to said heating member and coaxial with the aperture thereof, a heat-dissipating member concentrically arranged within and attached at its inner end by a collar of thermal insulating material to the opposite end of said tube, the outer end of said heat-dissipating member projecting through the aperture of said heating member and completely spaced therefrom and terminating in a flared portion arranged for entrance into the central aperture of the coil to flare the coil aperture simultaneously with the fusing of the interleaving material of the coil by contact with the heating element, and means attached to said tube for supporting the same.

6. A tool for fusing the ends of heat-fusible material wound between layers of windings in an electrical coil and simultaneously therewith flaring an end of the central core-receiving aperture of the coil comprising an annular heating element, a perforated tube attached to said element at its central opening and coaxial therewith, a flaring tool support mounted within said tube and supported thereon at the end thereof removed from the annular element, a collar of thermal insulating material surrounding and supporting said end of the flaring tool support within the tube, the opposite end of said support closely surrounding the wall of the central aperture of the heating element, a second collar of thermal insulating material surrounding said flaring tool support intermediate its length and spaced from the tube, a flaring tool on the outer end of said support for engagement with the central aperture of a coil, the interleaving material of which is to be fused, and members adjustably mounted in the wall of the tube and engageable with said second collar for maintaining the outer end of the flaring tool support concentric with the central aperture of the heating element.

EDWARD F. MARIK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

